PMS MCQs

The lens focuses incoming light onto the retina.
Photoreceptor cells then convert light into nerve signals.

Red light has the longest wavelength in the visible spectrum.
Violet has the shortest visible wavelength.

Violet light has the shortest wavelength among visible colors.
It also has the highest visible-light frequency.

Rayleigh scattering is stronger for shorter visible wavelengths.
Scattered blue light reaches observers from many directions.

At boiling, vapor bubbles form throughout the liquid.
It occurs when vapor pressure matches external pressure.

Sunlight travels through more atmosphere near the horizon.
Much of the shorter-wavelength light is scattered away.

Atmospheric pressure decreases with altitude.
Lower pressure allows water to boil at a lower temperature.

Sound begins with vibrating matter.
It travels through a medium as pressure variations.

Boiling water is cooler at high altitude.
The lower cooking temperature slows many cooking processes.

Sound requires particles to transmit vibrations.
A vacuum contains too few particles for sound propagation.

Thermal radiation travels as electromagnetic waves.
It does not require a material medium.

Space between the Sun and Earth is nearly a vacuum.
Solar energy reaches Earth as electromagnetic radiation.